Which of the following is NOT true in respect of migration?

Unregulated migration to the metropolitan cities of India has caused overcrowding Development of slums in industrially developed states such as Maharashtra, Gujarat, Karnataka, Tamil Nadu and Delhi is a negative consequence of unregulated migration within the country. Age and skill selective out migration from the rural area have positive effect on the rural demographic structure Migration leads to intermixing of people from diverse cultures. It has positive contribution such as evolution of composite culture and breaking through the narrow considerations

Age and skill selective out migration from the rural area have positive effect on the rural demographic structure

Age and skill selective out migration from the rural area have adverse effect on the rural demographic structure.